Electric meter



Dec.' `7 1926. 1,609,687

c. E. J. BRANDT ET AL ELECTRIC METER Filed Dec;.v.14. 1925 2 Sheets-Sheet l fsgj.

M f x 2 ffy-3- fnl/enfans 6T E JEM/7dr fbg/Waver /CP/W. Fc/v ref Dec 7 I 1,609,687 C. E. J. BRANDT ET AL v ELECTRIC METER Fil Dec. 14. 1923 2 Sheets-Sheet 2 and Patented Dec. 7, 1926.

UNrrl-:D STATES PATENT OFFICE.

CHARLES EMILE JULES BRANDT, EMILE ALBERT FOUILLERET, AND REN MARCEL- FIGHTER, OF PARIS, FRANCE.

ELECTRIC METER.

Appncation med December 14,1923. serial No. 630,780.

The present invention has for its object' an electric meter admitting the ready application of our stroboscopi'c method of regulation of electric meters as explained in French Patent 560,664. This method requires that the armatures of the meter under test and of the standard meter shall bear on one side `various equidistant lines or radially stamped impressions which latter add rigidity to the disc. Also the armature should be sufficiently stable when rotating we obtain this by constituting the armature by a central part of tapered or cylindrical shape connected with a flat part in the shapeof a disc, the whole being sccured to a shaft in two parts.

The appended drawings show by way of example a constructional form of electric meter of the single phase induction type arranged in accordance with our invention.

vFig; -1 is a front elevation of the meter, with the cover and the dial removed.

Fig. 2 is ai sectional view of the meter. Fig. 3 is a cross-section of the armature, and Fig. 4 a plan thereof.

Fig. 5 is a perspective view of the mag netic circuit. L

Fig. 6.is a like view of the short-circuited rin 'Ighe said meter is contained in a case consisting of a back part 1 and a cover 2 f1tted thereto', with the use of a compressed felt or like packing 3 which is attached to the back part in a suitable, manner. The laminated magnetic circuit 4 is provided with a fine wire coil 5, Fig. 2, in shunt with the main line and with a pair of heavywire coils 6 in series with the line; the magnetic structure is suitably secured to the back part of the case, for instance by means of the screws 7 and 8; to the said magnetic structure is secured in a readily removable manner, for instance b v the screws ,9, the base plate 10 to which the various parts of the meter are attached.

At the center of said plate is an aperture 11 for the passage of the armature whereof the bearings are mounted at 12, 12 upon the plate 10 on the side opposite the magnetic structure; said bearings carry the halfshats 13, 13' of the armature, which latter consists of a conical part 14 joined to a disc 15 and secured to the shaft, for example by thepressing process; the disc 15 traverses the aperture 11 and moves in the air gap of the said magnetic structure.

The armature is made of a light metal or alloy, for example of laluminium or magnesium; said armature, Figs. 3 and 4, isv

made of a single stamped or pressed piece, and it has upon the upper side of the at part 15 various equidistant radial marks 15 which may be formed during the operation of stamping or pressing the armature. By this construction we obtain a very light and sufficiently rigid armature whose centre of gravity is below the pivoting point it is held in equilibrium without the aid of the upper bearing 12 which serves lsolelyr to guide the shaft, so that it will be very steady when rotating, and is thus well adapted for the use of the stroboscopic regulating method. The radial marks 15 serve as gulding lines during the-adjustment. On the shaft 13 isa screw-threaded part 16 engaging a gear wheel 17 coacting with the gearing 18 of the dial 19; the said gearing is of any known type and is not herein illustrated in detail;

.it is supported by a lug 2O integral with the plate 10.

On the end of the core of the coil 5 is mounted a short-circuited ring 21, for 'ex-' ample of soft copper, which can be regulated both as to height and direction relative to an axis parallel to its plane, andto this end it is secured to the said magnetic circuit element for example, b a screw 22- passing through an elongate hole in the said ring,

The regulating element of the meter consists of a'permanent magnet 23, Fig.v 1, 00

which exercises a damping action upon the armature, and it is supported by a lug 24 secured to the base plate 1Q. The screw 25 is screwed into the lower branch of the magnet 23 and it passes through a hole in the lug 24; said screw serves as a pivot for the magnet and by its use the latter can be lixed in its definite posit-ion when the adjustment is completed. The ma et is also secured to a clamping piece 2 pivoted to a fork 28,which"is connected with a nut 29 movable on a screw-threaded rodV 30 secured vto the plate 10; upon turning the nut, thc magnet can be moved with respect to the armature by turning `on the pivot 25.

The meter further comprises an auxiliary regulating element consisting of a reaction plate 31 movable in the air gap of the magnetic structure 4 below the dlsc of the armature 15; said plate 31 is bent at right angles at one side 32 and is provided with a slot `33 cti-operating with a screw 34 for securlis provided around its entire rear facewith a rib 26, and when the meter is mounted, the said rib will bear directly upon the support and will prevent frauds by deformation of the meter case such as have been observed.

At the lower part of the case is situated the terminalbox 35 made of porcelain or like insulation and secured to the case by the screws 36; said box has at the front a plurality of recesses 37 containing the terminals 38 which are connected with the inner contact pieces 39 .of the terminal box and which are also connected to the ends of the coils 5 and 6; 'two of these terminals 38,l 38c are used for the main line Wires, and the terminals 38.., 38h are connected to the ends of the operating circuit.

Fig. 5 is" a perspective view of the magnetic structure carrying the coils 5 and 6,

and it consists of the laminated iron element 40 made in one or two parts to facilitate the insertion of the coils, and formed as -herein illustrated. The upper horizontal part is secured by the screws 44, between two plates 41 which are bent out at the ends vat 42, 43; the parts 42, 43 are aperk tured for the passage of screws 7, 9. v

The lower o bli ue part of the laminated element 40j is he d between the plates 46 whose ends are bent out at 47, 48. The ends 47 are apertured to receive the screws v8, and the ends 48 'support the laminatediron piece 49 in which the iron plates are transversal, said piece serving as a core for the coils 6; the piece 49 is secured to the'part of the plate 48 by the screws 50. The rivets Lacasse 51 serve to assemble the iron plates in a rigid construction. At 22, at the central part of the core 40, is disposed the screw for mounting the said short-circuited ring. In the constructional form shown in Fig. 6, said ring is formedv from a sheet of soft copper; it comprises an annular part 52 whose inner space will allow it to fit loosely on the end of the core 40, and two lugs 53 having theelongated holes 54, said lugs being folded upon the ring 52.

When regulating the meter, adjusts the nut 29 until the speed of the armature is such that in'combination with a stroboscopic device, such as a rotating shutter, the speed of which is maintained constant and equal to a given amount during` the operation, the armature appears motionless; the meter is thus regulated for the speed considered. It will then suffice to fix the magnet in place by means of the screw 25. If the meters are to be used for light loads, the preceding adjustment is repeated with the metersbplaced upon a. lline at small load, and without interfering with the magthe workman net 23 or the nut 29, the operator moves v the reaction plate 31 and then definitely s'ecures it iniplace by means of the screw 34.

What we claim is:

In an electric meter of the induction type the combination of an elongated stationary pivot bearing, a rotating part pivotin on said bearing and comprisin a light ho low armature provided with equidistant stamped impressions and a vertical shaft secured to the top part of the armature, the center of gravity of said rotating part beingl below the pivoting point, and an upper earing secured to the casing of the meter and adapted to guide the vertical shaft.

In witness whereof they have hereunto set theirhands.

CHARLES EMILE JULES BRANDT. EMILE ALBERT FOUILLERET.

mit meer' marsa 

